package com.song.storm_demo;

import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.LocalDRPC;
import backtype.storm.StormSubmitter;
import backtype.storm.drpc.LinearDRPCTopologyBuilder;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseBasicBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;

/**
 * This topology is a basic example of doing distributed RPC on top of Storm. It implements a function that appends a
 * "!" to any string you send the DRPC function.
 * <p/>
 * See https://github.com/nathanmarz/storm/wiki/Distributed-RPC for more information on doing distributed RPC on top of
 * Storm.
 */
public class BasicDRPCTopology {
  public static class ExclaimBolt extends BaseBasicBolt {
    @Override
    public void execute(Tuple tuple, BasicOutputCollector collector) {
      String input = tuple.getString(1);
      collector.emit(new Values(tuple.getValue(0), input + "!"));
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields("id", "result"));
    }

  }

  public static void main(String[] args) throws Exception {
    LinearDRPCTopologyBuilder builder = new LinearDRPCTopologyBuilder("exclamation");
    builder.addBolt(new ExclaimBolt(), 3);

    Config conf = new Config();

//    if (args == null || args.length == 0) {
//      LocalDRPC drpc = new LocalDRPC();
//      LocalCluster cluster = new LocalCluster();
//
//      cluster.submitTopology("drpc-demo", conf, builder.createLocalTopology(drpc));
//
//      for (String word : new String[]{ "hello", "goodbye" }) {
//        System.out.println("Result for \"" + word + "\": " + drpc.execute("exclamation", word));
//      }
//
//      cluster.shutdown();
//      drpc.shutdown();
//    }
//    else 
    {
      conf.setNumWorkers(3);
      StormSubmitter.submitTopology("Base-rpc", conf, builder.createRemoteTopology());
    }
  }
}
